Optogenetic activation (using Cnoc\ChR1Cs.IVS.20xUAS.Venus with 635 nm (red) light) of Scer\GAL4GMR11H09 neurons does not significantly increase proboscis extension reflex (PER) in the absense of nutritional stimuli, compared to controls; PER in response to 100 mM sucrose presentation is significantly reduced, compared to controls; this aversion is sustained for several minutes after activation has finished.
Inhibition (using shi1.UAS at 30[o]C) of Scer\GAL4GMR11H09 neurons does not affect PER in response to 100 mM sucrose presentation, but does significantly increase PER in response to presentation of a sweet and bitter mixture compared to controls.
Inhibition (using shi1.UAS at 30[o]C) of Scer\GAL4GMR11H09 neurons significantly suppresses the reduction in PER response to presentation of 100 mM sucrose seen during and after quinine application to the proboscis, compared to controls; this effect is also seen when silencing occurs only during, but not only after, quinine application.